Timing attachment for cameras.



Patented Mar. 26, |90I.

B. HERNHUTER. TIMING ATTACHMENT FR CAMERAS.

(No Model.)

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UNITED STATES PATENT QEEICE.

BERNHARD HERNHUTER, 0F NEV YORK, N. Y.

TIMING ATTACHMENT FR GAMER/l SPECIFICATION formingpart of Letters Patent No. 670,635, dated March 26, 1901.

Application filed June 20.1900. Serial No. 20,917. (No inndel To n/ZZ/ whom, t may concern:

Be it known that I, BERNHARD HERNHUTEE, a citizen of Austria-Hungary, and a resident oi' New York city, county and State of New York, have invented certain new and useful Improvements in Photographic Cameras, of which the following is aspeciiication.

This invention relates to a photographic camera for time exposures which is so constrncted that the period of exposure is struck off in seconds by a clockwork which is automatically released when the shutter is open ed. Thus the duration of the exposure may be controlled in a very simple and accurate manner without consulting a watch or without Airst setting the shutter to any previously-determined period of time.

In the accompanying drawings, Figure l is a front View of a camera provided with my improvement, showing the shutter closed; Fig. 2,'a vertical section on line 2 2, Fig. 1; Fig. 3, a front View, partly in section, with the clockwork removed and showing the shutter open; and 4, a horizontal section on line 4 Ai, Fig. 2, with the clockwork removed.

The letteraJ represents the front of a camera A, having the objective lens ct, and ZJ is the shutter, pivoted to the front a at b. The shutter is operated by means of a push-rod c, pivoted to the shutter at c and iniiuenced by a spring c2, which tends to draw the rod outwardly and to thus close the shutter. The rod c extends through a slot c2 of the camera, which slot is of a width to permit a slight lateral play of the rod. VBy means of a notch c3 on'rod c, adapted to engage the edge of a face-plate d, the rod may be locked in its innermost position to hold the shutter open, Fig. 3. After the exposure has lasted for the time desired the rod cis slightly depressed to become released from plate d, when the spring czwill draw the rod o utwardly and close the shutter, Fig. l.

The rod c, besides operating the shutter in the manner described, has the additional function of setting off an alarm that strikes off seconds while the shutter is open and is silenced when the shutter is closed, so that in this way the duration of the exposure may be accurately timed by the ear.

The mechanism for carrying this result into effect is as follows: ln front of the plate a there is secured to the camera a partition e, perforated at c in line with the lens et'. The partition c carries a clockwork f, having a bellf and hammerfii, which is adjusted to strike off equal periods of time, preferably seconds. ed to be engaged and arrested by the front arm g of a two-armed lever, which is pivoted to the partition c at g and which is normally held against the ['ly by a spring h. The rear arm gid of the lever projects through a perforation c2 of partition c and is in the path of the push-rod c. When the rod cis pushed inward to open the shutter, it will simultaneously tilt the lever g g2 and swing its arm g backward to release fly f3, as indicated by dotted lines, Fig. e. The alarm will now promptly strike off the seconds, which may thus be easily counted to accurately control the time of exposure. When the alarm has struck off the number of seconds intended for the exposure, the rod c is released, when the spring c2 will draw it outward and close the shutter. At the same time the rod cwill release the lever-arm g2, so that the leverarm g will be thrown against the fly f3 by spring h to arrest the clockwork, as indicated by full lines in Fig. 4f. Thus it will be seen that the photographer can time the exposure with absolute accuracy without any setting of the apparatus and without being obliged to consult a watch.

A 'photographic camera provided with a push-rod, a shutter and a lever operatively connected to the push-rod, an alarm, and a spring for throwing the lever against the alarm upon the withdrawal of the push-rod, substantially as specified.

Signed by me at New York city, county and State of New York, this 19th day of June, 1900. i

F. v. BEIESEN, WILLIAM SCHULZ.

The [iyf3 of the clockworkis adapt 

